455 



Subgenus Phocana. 

 2509. The skeleton of the common Porpoise (Delphinus phoceena). 



Number of alveoli : ^-^="2. Anchylosis has taken place in all the cervical vertebrae, 

 and the head of the first rib rests upon their coalesced bodies. There are 56 other vertebrae, 

 twelve of which support moveable ribs ; but the thirteenth pair seems to have been lost. 



Mm. South. 



2510. The separated bones of the skull of a young Porpoise (Delphinus phoceena). 



Presented by Prof. Owen, F.fi.S. 



2511. The left moiety of a vertically bisected cranium of a Porpoise (Delphinus 

 phocaend). Hunterian. 



2512. The cranium, deprived of the calvarium, of a Porpoise (Delphinus phoceena). 



Number of alveoli : 25 25. 



Presented by William Cliff, Esq., F.R.S. 



2513. An anterior dorsal vertebra of a Porpoise (Delphinus phoccend). Hunterian. 



2514. A posterior vertebra of a Porpoise (Delphinus phoceend). 



The transverse processes did not support ribs ; they are long, and incline forward, as does 

 the long spinous process. 



Hunterian. 



2515. The skull of the common Grampus (Delphinus area, Linn.). 



Number of alveoli : ijEJ5 = 46. The teeth are wanting. The sockets of the large inter- 

 mediate teeth are subquadrate, with the longest diameter across the jaws. The symphysis is 

 short, in the form of an unequal-sided triangle with the angles rounded off. 



A specimen of this species, thirty feet in length, was captured in the Thames in the year 

 1 793. Sir Joseph Banks transmitted a figure of it to M. de Lacepede. 



Hunterian. 



2516. The right petrotympanic bone of a Grampus (Delphinus orcd). Hunterian. 



2517. The skull of a Cape Grampus (Delphinus orca). 



It is of somewhat smaller size, and differs from the preceding specimen chiefly in the 

 greater development of the tuberosities and curved ridges at the sides of the snperoccipital, 



